Skip to Main Content
Evaluating links between forest harvest and stream temperature threshold exceedances: the value of spatial and temporal dataAuthor(s): Jeremiah D. Groom; Sherri L. Johnson; Joshua D. Seeds; George G. Ice
Source: JAWRA Journal of the American Water Resources Association. 53(4): 761-773.
Publication Series: Scientific Journal (JRNL)
Station: Pacific Northwest Research Station
Download Publication (436.0 KB)
DescriptionWe present the results of a replicated before-after-control-impact study on 33 streams to test the effectiveness of riparian rules for private and State forests at meeting temperature criteria in streams in western Oregon. Many states have established regulatory temperature thresholds, referred to as numeric criteria, to protect cold-water fishes such as salmon and trout. We examined across-year and within-year patterns of exceedance at control and treatment stream temperature probes. Determining whether an exceedance at the downstream end of a harvest was unambiguously related to harvest proved surprisingly difficult. The likelihood of a site exceeding its numeric criterion appeared related, in part, to the site’s preharvest temperature range. Four control reaches as well as three preharvest treatment reaches exceeded their numeric criteria, necessitating additional analysis to evaluate timber harvest impacts. Nine percent of sites (3 of 33) both exceeded their numeric criteria and exhibited a potential harvest effect (16.7% of private sites [3 of 18], 0% of State sites [0 of 15]). After harvest, exceedances were typically observed in only the first of the two post-harvest years. These findings highlight the importance of including temporal and spatial controls in temperature assessments of numeric criteria when the assessment’s purpose is to determine whether exceedances are related to human activities.
- Visit PNW's Publication Request Page to request a hard copy of this publication.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationGroom, Jeremiah D.; Johnson, Sherri L.; Seeds, Joshua D.; Ice, George G. 2017. Evaluating links between forest harvest and stream temperature threshold exceedances: the value of spatial and temporal data. JAWRA Journal of the American Water Resources Association. 53(4): 761-773.
Keywordsmonitoring, environmental regulations, nonpoint source pollution, temperature, best management practices, forest harvest.
- Compositional stability of boreal understorey vegetation after overstorey harvesting across a riparian ecotone
- Stream temperature responses to timber harvest and best management practices—findings from the ODF RipStream project
- The paradox of cooling streams in a warming world: regional climate trends do not parallel variable local trends in stream temperature in the Pacific continental United States
XML: View XML